Conversion failed when converting the varchar value to int

 Imports System.Data.SqlClient
Imports System.Web.Configuration
Partial Class Users_Sales_Form
    Inherits System.Web.UI.Page

    Protected Sub SubmitButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SubmitButton.Click

        Dim objConnection As SqlConnection
        Dim objDataCommand As SqlCommand
        Dim sSQL As String
        Dim ConnectionString As String

        Dim empID As Integer
        Dim Tdte As String
        'Dim Tdate As Date
        Dim transID, TransLid As String
        'Dim TLdate As Date
        Dim TLdte As String
        Dim proID, quan As String


        empID = empidtxt.Text
        Tdte = transdttxt.Text
        'Tdate = Convert.ToDateTime(transdttxt.Text.ToString)
        'Tdate = transdttxt.Text = Date.Today()
        TransLid = tranlidtxt.Text
        'TLdate = Convert.ToDateTime(transdttxt.Text.ToString)
        'TLdate = transdttxt.Text = Date.Today()
        TLdte = transdttxt.Text
        proID = proidtxt.Text
        quan = quantitytxt.Text
        transID = transidtxt.Text

        ConnectionString = WebConfigurationManager.ConnectionStrings("UCSConnectionString").ConnectionString

        objConnection = New SqlConnection(ConnectionString)
        objConnection.Open()

        sSQL = "Insert into Sales (Emp_id, T_dt)" & _
        "values('" & empID & " ', ' " & Tdte & " ')"


        objDataCommand = New SqlCommand(sSQL, objConnection)
        objDataCommand.ExecuteNonQuery()

        sSQL = "Insert into Transaction_Line (TransL_id,Trans_id, TL_dt, Pro_id, Quantity)" & _
            "values('" & TransLid & "', '" & TLdte & "', '" & proID & "', '" & quan & "', '" & transID & "')"

        objDataCommand = New SqlCommand(sSQL, objConnection)
        objDataCommand.ExecuteNonQuery()


        objConnection.Close()



    End Sub
End Class